Respuesta :

ujalakhan18

Answer:

D. 300 years

Step-by-step explanation:

Mean = [tex]\frac{sum of observations}{no. of observations\\}[/tex]

Here we know the mean which is 15 and the number which is 20

Total age = 15 × 20

Total Age = 300 years

sana96

Answer:

D. 300 Years is the correct answer.

Step by Step Explanation:

20×15= 300